There are two ways that you can improve performance of your photoshop. One is via upgrading and tweaking your PC hardware, and the other is through software settings of your OS, photoshop, and other related programs. In terms of hardware, the key PC components that may have an impact on the performance of photoshop are the amount of RAM, number of CPU cores and their speed, VRAM of your graphics card, type of hard drives you are using (HDD vs. SSD, and monitor size / type. In terms of software, one has to consider OS version, anti virus programs, hardware settings and their drivers, photoshop updates, photoshop plugin updates, how many programs are running in the background, and numerous settings that have to be performed inside photoshop. To learn more about how you can improve the performance of your photoshop, watch the video linked below, in which I go through all those items in depth.